When is a soql query selective in apex?

When is a soql query selective in apex?

A query is selective when one of the query filters is on an indexed field and the query filter reduces the resulting number of rows below a system-defined threshold. The performance of the SOQL query improves when two or more filters used in the WHERE clause meet the mentioned conditions.

Can a textarea field be filtered in soql?

Unlike string fields, textarea fields cannot be specified in the WHERE clause of a queryString of a query () call. To filter records on this field, you must do so while processing records in the QueryResult.

When to use security enforced in soql select?

In other words, security is enforced on what the SOQL SELECT query returns, not on all the elements that go into running the query. After the WHERE clause if one exists, else after the FROM clause.

What happens if field access is hidden in apex?

If field access for either LastName or Description is hidden, this query throws an exception indicating insufficient permissions. If field access for Website is hidden, this query throws an exception indicating insufficient permissions.

What are the limits of soql for objects?

SOQL limits are defined for the ContentDocumentLink object, ContentHubItem object, big objects, external objects, NewsFeed, KnowledgeArticleVersion, RecentlyViewed, TopicAssignment, UserRecordAccess, UserProfileFeed, and Vote. Some objects or situations have specific limits on SOQL.

How to determine the execution limit in apex?

Limits apply individually to each testMethod. To determine the code execution limits for your code while it’s running, use the Limits methods. For example, you can use the getDMLStatements method to determine the number of DML statements that have already been called by your program.

What is the threshold for selectivity in apex?

The selectivity threshold is 10% of the first million records and less than 5% of the records after the first million records, up to a maximum of 333,333 records. In some circumstances, for example with a query filter that is an indexed standard field, the threshold can be higher. Also, the selectivity threshold is subject to change.

When to terminate a non-selective soql query?

To avoid long execution times, the system can terminate nonselective SOQL queries. Developers receive an error message when a non-selective query in a trigger executes against an object that contains more than 200,000 records. To avoid this error, ensure that the query is selective.

When does the performance of a soql query improve?

The performance of the SOQL query improves when two or more filters used in the WHERE clause meet the mentioned conditions. The selectivity threshold is 10% of the first million records and less than 5% of the records after the first million records, up to a maximum of 333,333 records.

Why is it important to register for Selective Service?

The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. Why is Selective Service Important?

How to work with very large soql queries?

Working with Very Large SOQL Queries Your SOQL query sometimes returns so many sObjects that the limit on heap size is exceeded and an error occurs. To resolve, use a SOQL query for loop instead, since it can process multiple batches of records by using internal calls to query and queryMore.

To avoid long execution times, the system can terminate nonselective SOQL queries. Developers receive an error message when a non-selective query in a trigger executes against an object that contains more than 200,000 records. To avoid this error, ensure that the query is selective.

What to do when your soql query returns too many sobjects?

Your SOQL query sometimes returns so many sObjects that the limit on heap size is exceeded and an error occurs. To resolve, use a SOQL query for loop instead, since it can process multiple batches of records by using internal calls to query and queryMore.